As new information surfaces on the Isabella Stewart Gardner heist, Slate looks at why so many art heists go unsolved, and why recovering these works often proves so difficult, including long storage times for stolen works and the difficulty in keeping trained police to investigate these crimes. “The art crime team still exists—it’s managed by a trained archaeologist, not an FBI agent—but turnover is rampant,” says Robert Wittman, who previously headed up the FBI’s art theft investigations.Read more at Slate